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COI Seminar Series

Thursday, April 23, 2009

Redfield Auditorium - 12:00 Noon
Co-Sponsored by Biology Department

Efforts to protect and restore Buzzards Bay: Scientific and political challenges for the next decade

Joe Costa
Buzzards Bay National Estuary Program
Mass. Coastal Zone Management

Abstract
The Buzzards Bay NEP is updating its 1992 watershed management plan to reflect progress made and to address new issues. The updated plan will contain more than 250 town and agency-specific recommendations to protect and restore water quality and living resources in the bay and surrounding watershed. Coastal waters have profoundly benefited from the federal Clean Water Act (CWA), and the state's sanitary waste disposal and wetland laws have helped offset many impacts from new development, but environmental degradation continues in most estuaries. Restoration to earlier conditions will require full implementation of CWA sections deferred for 20 years. The most ambitious of these will be efforts to comply with bacteria and nitrogen Total Maximum Daily Loads, with most responsibilities and costs (billions) falling to local government. The presentation will include examples of the interplay of science, environmental law, coastal policies, and regulations to achieve environmental goals.

Thursday, May 21, 2009

Redfield Auditorium - 12:00 Noon
Co-Sponsored by Biology Department

The Impact of Climate Change on Phenology, Productivity, and Benthic-Pelagic Coupling in Narragansett Bay

Scott Nixon
Graduate School of Oceanography
University of Rhode Island
and
Robinson (Wally) Fulweiler
Department of Earth Sciences
Boston University

Abstract
The timing and magnitude of phytoplankton blooms have changed markedly in Narragansett Bay, RI (USA) over the last half century. The traditional winter-spring bloom has decreased or disappeared and shorter, often intense, summer diatom blooms have become common at other times, replacing the traditional flagellate blooms of the past. The mean abundance and biomass of phytoplankton appear to have decreased based on almost 50 years of biweekly monitoring by others at a mid bay station. These changes in phenology and the oligotrophication of Narragansett Bay appear to have greatly decreased the quantity and (perhaps) quality of the organic matter being deposited on the bottom. Benthic metabolism as reflected in oxygen uptake, nutrient regeneration, and the net flux of N2 gas has declined. During at least one summer, net denitrification was replaced by net heterotrophic N fixation. Higher trophic levels also appear to be affected as decades of standard weekly trawls show that the winter biomass of bottom feeding epibenthic animals has declined sharply at the mid bay station.